Transformer bobbins with means for mounting terminals thereon



Feb. 17, 1970 A. JOHANNSEN ET AL 3,496,505 TRANSFORMER BOBBINS WITH MEANS FOR MOUNTING TERMINALS THEREON Filed July 6. 1967 2 Sheets-Sheet 1 I NVEN TORS' AFT/ 0E JO/l/M'IVSEIV BY WALTER P505255 Arrows) Feb. 17, 1970 A. JQHANNSEN ETAL 3,496,505

TRANSFORMER BOBBINS WITH MEANS FOR MOUNTING TERMINALS THEREON Filed July 6. 1967 2 Sheets-Sheet 2 B mars? en age Y 't v United States Patent US. Cl. s36 20s 2 Claims ABSTRACT OF THE DISCLOSURE Terminal. lugs, bus Wires, lead wires or printed circuit terminalsare attached to a bobbin by means of members made i of non-conducting material, mounted on the bobbin and having means to receive portions of said lugs or wires or terminals therethrough. Said terminals or wires each case include portions at right angles to one another, and each comprises a free terminal end to whichvfvfire ends of coils on the bobbin may be attached in conductive contact therewith. In one form the members of non-conductive material comprise bars formed with holes force fitted on locating pins extending from thebobbin. In another form, said non conducting membersjcomprise sleeves of heat shrinkable material surrounding extensions on the bobbin through which portions of; the terminals or wires or lugs extend. These sleeves are,.,heated to shrink and fix the terminals to said extensions.

BRIEF SUMMARY OF THE INVENTION This invention relates to transformer bobbins. It is particularly directed to bobbins provided with a plurality of terminals for attachment to wires or other conductors.

An object of this invention is to provide a bobbin of the character described having improved means for attaching terminals thereto and comprising non-conductive means attached to said bobbin.

Another object of this invention is to provide a bobbin of the character described provided with connected passages at right angles to one another receiving portions of connected conductors at right angles to one another, with portions of said conductors projecting from the bobbin, said bobbin comprising attached together parts to facilitate assembly of said conductors with said bobbin.

Yet another object of this invention is to provide a strong and durable bobbin of the character described which shallbe relatively inexpensive to manufacture, easy to assemble and which shall yet be practical and efficient to a high degree in use.

Other objects of this invention will in part be obvious and in part hereinafter pointed out.

The invention accordingly consists in the features of construction, combinations of elements, and arrangement of parts which will be exemplified in the construction hereinafter: described, and of which the scope of invention will' be indicated in the following claims-f BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING In the accompanying drawing, in which are shown various illustrative embodiments of this invention,

FIG. 1 is a perspective view of a bobbin embodying the invention, with transformer parts shown in dot-dash lines;

FIG. 2 is a cross-sectional view taken on line 2-2 of FIG. 1;

FIG. 3 is a cross-sectional view taken on line 33 of FIG. 2',

FIG. 4 is a cross-sectional view similar to FIG. 2 but illustrating a modification;

FIG. 5 is a cross-sectional view taken on line 55 of FIG. 4;

FIG. 6 is a cross-sectional view taken on line 66 of FIG. 4;

FIG. 7 is an end view of a bobbin embodying a modified form of the invention;

FIG. 8 is a cross-sectional view taken on line 8-8 of FIG. 7;

FIG. 9 is a perspective view of one of the plastic bars;

FIG. 10 is a cross-sectional view taken on line'1010 of FIG. 7;

FIG. 11 is a view another modification;

FIG. 12 is a view similar to FIG. 11 but illustrating a further modification; and

FIG. 13 is a cross-sectional view taken on line 13-13 of FIG. 12.

DETAILED DESCRIPTION OF THE INVENTION Referring now in detail to the drawing, 10 designates a transformer comprising a bobbin 11 on which is mounted a usual core 12. The bobbin 11 comprises end flanges 13 interconnected by a tubular portion 14 of rectangular cross-section and forming a through opening 15 through which a portion of the core passes. The coils of the transformer surround portion 14 and are located between flanges 13. The flanges 13 extend outwardly from the ends of the tubular portion 14. The ends of the coils on the tubular portion 14, must be attached to terminals connected to wires or other conductors. The present invention concerns the mounting of the terminals or other conductors on the end faces 13 of the bobbin.

In FIGS. 1-6', each of the flanges 13 are formed top and bottom with integral outwardly projecting parallel extensions 16 of semi-cylindrical cross-section. The top flanges 16 are concave at their undersides and the bottom extensions 16 are concave at their upper sides. Each of the extensions 16 is formed with a vertical through opening 18 adjacent a face flange 13.

In FIGS. 1 and 2 there is illustrated the attachment of a conductor which comprises an insulated wire 20 to the bobbin. The wire 20 comprises an elongated wire portion 21. It may be surrounded by insulation 22. The outer end of the wire is bared of insulation and a portion thereof is bent at right angles to form a terminal 23. The terminal 23 is slidably moved through the opening 18 in the extension 16 so that part of the wire 21 adjacent the terminal, is received in the semi-cylindrical cavity in said extension. A tube 25 of heat shrinkable plastic material is threaded onto the insulated wire 20 and then moved into surrounding position relative to the semi-cylindrical extension 16 and said adjacent portion of the wire 21. The tubes 25 are then heated to shrink and hence attach the wire to the bobbin.

In FIG. 4 the construction of the bobbin flanges 13 and the extensions 16 is the same as in FIGS. 1, 2 and 3, however, in FIGS. 4, 5 and 6 the lugs 30 are attached to the bobbin face 13. The lug 30 has a horizontal portion 31 and a vertical terminal portion 32. The extension 16 is formed with a wider opening 18a instead of the opening 18, to permit passage therethrough of the flat lug portion 32. The lug 30 is made of flat metal, The horizontal portion 31 has wings 33 and 34, as shown in FIG. 5. The sleeve 25 is also threaded onto the lug and extension and then heated to shrink and to held the lug tightly against the extension 16. Instead of using an insulated wire 20, a wire without insulation may also be used.

In FIGS. 7, 8, 9 and 10 there is shown a bobbin 11a similar to the bobbin 11 except that its end flanges 1311 are each formed at top and bottom with a pair of outsimilar to FIG. 10 but illustrating wardly extending locating pins 40. On each pair of locating pins 40 there is force fitted a bar or block 41 made of plastic or other non-conducting material and formed with openings 42 to receive the locating pins 40. Each bar 41 is formed with a plurality of horizontal through openings 43 and with vertical grooves 44 at the surface thereof, facing the flanges 13a and extending to said openings 42. As shown in FIG. Wires 45 each has a horizontal portion 46 passing through the horizontal through opening 43 and a vertical terminal portion 47 passing through the groove 44 and extending beyond the bar. The terminal portions 47 are thus disposed between the bars 41 and the flanges 13a of the bobbin.

In FIG. 11 there is shown a construction in which the wire 45 is replaced by an insulated wire 45a. Otherwise the construction is the same as shown in FIGS. 7-10.

In FIGS. 12 and 13, each wire 45 is replaced by a.

lug 50. Bars 41a replace the bar 41 and these have flat horizontal through openings 43a and flat rear grooves 44a. The lugs have horizontal flat portions 51 passing through the through openings 43a and outwardly extending terminal portions 52 received in the grooves 44a and.

extending beyond the flanges 13a of the bobbin. The lugs 50 are of usual construction and are provided with wings 55, 56 as shown in FIG. 13.

It will now be understood that the ends of the coils mounted on the bobbin and between the end flanges 13 or 13a, may be attached to the terminals 23, 32, 47 or 52 in the usual manner.

It will thus be seen that there is provided an article in which the several objects of this invention are achieved, and which is well adapted to meet the conditions of practical use.

As possible embodiments might be made of the above invention, and as various changes might be made in the embodiments above set forth, it is to be understood that all matter herein set forth or shown in the accompanying drawings, is to be interpreted as illustrative and not in a limiting sense.

1. In combination, a bobbin provided with end flanges interconnected by a tube, a conductor, a non-conducting means separate from the bobbin, means for attaching sand non-conducting means to said bobbin, and means on said non-conducting means to mount said conductor on said bobbin with a portion of said conductor projecting from said bobbin-sa id non-conducting means comprising a member having a through passage through which a portion of said conductor passes, said member comprising a bar of plastic material provided with openings, and said means to mount said non-conducting means on said bobbin comprising locating pins on said bobbin frictionally received in said'openings in said bar.

2. The'combination'of claim 1, said bar having a groove at a surface thereof contacting said bobbin, and a portion of said conductor passing through said groove.

References Cited UNITED STATES PATENTS 7/1961 France.

OTHER REFERENCES" Alphlex Shrinkable Tubing Catalog ST-27, Alpha Wire 00., New York, 1961.

ELLIOT A. GOLDBERG, Primary Examiner US. Cl. X.R. 242--118.4; 336-l92 

